High-altitude work components and high-altitude work method

Abstract

To provide a high place work member used more easily and wider in a target work range.SOLUTION: A high place work member 1 attached to a tip of an arm of a crane comprises: a frame 10f which is a frame body having a roughly square outer shape and in which at least one closed space (first closed space S1) is formed; first support pillars 11 only one of which extends outside from the frame; and a plurality of projected members 18a that project from the frame to the inside of the closed space without closing the closed space. A member which serves as a foothold for an operator is not provided.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a member for high-altitude work that is attached to the tip of the arm of a crane for high-altitude work, and a method for high-altitude work using the member for high-altitude work. [Background technology]

[0002] Conventionally, for high-altitude work such as tree pruning, electrical work in tall buildings, and exterior wall painting, aerial work vehicles have been used in which a box-shaped work platform is provided at the end of the arm of a crane and a control device for controlling the length and elevation angle of the arm is provided on the work platform. However, in such high-altitude work vehicles, a control structure electrically connected between the crane body and the work platform is required to control the length and elevation angle of the arm from the work platform, which causes problems of a complex configuration and high costs.

[0003] In addition, since the worker works while standing up in the box-shaped work platform, a control mechanism is required to keep the floor surface of the work platform horizontal regardless of the angle of the crane's arm, which makes the configuration complicated and increases the cost. Furthermore, the range in which the worker can work is limited to the range that the worker can reach while standing up in the box-shaped work platform. Therefore, in order to work in a wide range, the work platform needs to be moved, and the work of frequently moving the work platform is troublesome. In addition, since the box-shaped work platform is bulky, there is a problem that it is not possible to work in a small space where the work platform interferes with surrounding objects.

[0004] Meanwhile, it has also been proposed to attach a detachable box-shaped work platform to the tip of the arm of a crane to perform work at height (see, for example, Patent Document 1). With such a work platform, the length of the crane's arm and the angle at which it is raised and lowered are generally controlled by the crane itself or via a remote control operated by a worker standing on the work platform. This has a simpler configuration than the above-mentioned vehicle for working at height, which has a control device on the work platform, and has the advantage of being able to use a crane that can also be used for other purposes.

[0005] However, even with such a work platform for high-altitude work, the worker works while standing inside the box-shaped work platform, so a control mechanism is required to keep the floor surface of the work platform horizontal regardless of the angle at which the arms are raised, which results in a problem of a complex configuration and high costs.Furthermore, similar to the high-altitude work vehicle, there are disadvantages in that the range in which the worker can work is limited to the range that the worker can reach while standing inside the box-shaped work platform, and in that work cannot be performed in an environment where the bulky box-shaped work platform interferes.

[0006] In order to solve the problems of such a box-shaped work platform, the present applicant has proposed a frame-shaped member for high-altitude work attached to the tip of the arm of a crane (see Patent Document 2). This member for high-altitude work includes a main frame, an inner member extending from the main frame toward the inner space and forming a plurality of closed spaces in the inner space of the main frame, and a plurality of protruding members protruding from the inner member without further closing the closed spaces. Two ropes attached to the body of a worker are passed through the closed space, tension is applied to at least one of the ropes to support the body of the worker on the member for high-altitude work, and by changing the protruding member to which one rope is hooked, the anchor point can be moved without removing the rope, so that the worker can easily take various postures with his / her body leaning outward, and the work positioning system can perform work in a wide range. In addition, since it has a simple frame-shaped configuration, it has the advantage that it can be manufactured at low cost and can be inserted into a narrow space to perform work.

[0007] The applicant has been further developing the above-mentioned advantageous components for working at height, with the aim of making them even easier to use and expanding the range of applicable work (applications). The present invention was made during this process. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2003-171093 A [Patent Document 2] JP 2020-164267 A Summary of the Invention [Problem to be solved by the invention]

[0009] In view of the above-mentioned circumstances, an object of the present invention is to provide a member for working at height that is easier to use and has a wider range of applicable work, and a method for working at height using the member for working at height. [Means for solving the problem]

[0010] In order to solve the above problems, the member for working at height according to the present invention comprises: "A component for working at height that is attached to the tip of the arm of a crane, A frame having a substantially rectangular outer shape and at least one closed space formed therein; a first support portion extending outwardly from the frame; A plurality of protruding members protruding from the frame toward the inside of the closed space without closing the closed space; A first member having Equipped with The first member is There is no material that can be used as a foothold for workers Along with, The first support portion extends from one end of the frame, so that the first member has an "L" shape or a "L" shape. " It is something like that.

[0011] The "arm" of a crane is the rod-shaped part of the crane that extends and retracts, and refers to the part called the "jib" or "boom."

[0012] The member for high-altitude work of this configuration is used when external objects such as the branches and rump of trees, civil engineering and architectural structures, etc. are used as scaffolding. In the method for high-altitude work using the member for high-altitude work, two ropes (first rope, second rope) are used, which are fastened to the body of the worker and passed through the closed space of the member for high-altitude work. The first rope is mainly used as a rope (lanyard) that supports the body of the worker on the member for high-altitude work in a U-shaped hanging state. On the other hand, the second rope, as described later, is a rope that moves the anchor point without removing it from the member for high-altitude work, and is used as a moving rope when changing the position or posture of the worker. The first rope and the second rope are each tensioned by adjusting their lengths. The tension of at least one of the first rope and the second rope allows the body of the worker to be supported on the member for high-altitude work, ensuring a stable posture, and the work can be performed by the work positioning system.

[0013] By applying tension to at least one of the ropes, the worker can work in a position leaning outward from the platform, which allows for a wider range of work than working while standing inside a box-shaped work platform.

[0014] In addition, the member for working at height has a plurality of protruding members protruding from the frame toward the closed space inside the frame without further closing the closed space. Therefore, by using the member for working at height with the free ends of the protruding members facing upward, the anchor point, which is the intersection between the frame and the protruding members, can be moved without removing the second rope from the member for working at height. Therefore, by adjusting the length of the first rope to maintain a tensioned state and moving the anchor point of the second rope, the worker can vary his / her position and posture relative to the member for working at height, and can work in a wide range. Furthermore, by being able to move the anchor point of the second rope, the worker can always work in a stable and comfortable posture.

[0015] Furthermore, by using two ropes, each with adjustable length, even when the tension on one rope is loosened, for example when loosening the tension on the second rope to move the anchor point, the other rope remains tensioned, allowing the worker to maintain a stable posture.

[0016] Furthermore, at least one of the first rope and the second rope can be passed through the closed space within the frame and will not come off the member for working at height unless the worker intentionally removes it. Therefore, when changing the attachment position of one of the ropes to the member for working at height to place the worker in a position or posture that is easy for the worker to work in, even if the rope is removed from the member for working at height, the other rope still functions as a fall prevention rope (backup rope). Therefore, it is possible to effectively prevent the worker from falling and to work at height safely.

[0017] Furthermore, the member for working at height of this configuration is a structure in which only one first support column extends from a box-shaped frame, and has a very simple structure. In addition, while a conventional box-shaped work platform requires a control mechanism to keep the floor on which the worker stands horizontal regardless of the angle at which the crane is raised and lowered, the member for working at height of this configuration does not require such a mechanism. Therefore, the member for working at height of this configuration has a very simple structure and can be manufactured at low cost.

[0018] Furthermore, since only one first support portion extends from the frame and the structure does not have a member that serves as a foothold for the worker, it can be made lighter than a conventional member for working at height (Patent Document 2) that has a part that serves as a foothold in the main frame. Therefore, it is easy to attach the member for working at height to the arm of the crane. In addition, the configuration in which only one first support portion extends from the frame is close to an L-shape or a U-shape, and it is easier to enter a narrower space than a conventional member for working at height (Patent Document 2). Therefore, it is possible to perform work in a very narrow space that has a foothold, such as entering a tree canopy and using the branches or rump of a tree as a foothold, and the range of work targets is wider.

[0019] The member for high altitude work according to the present invention has the above-mentioned configuration. Replace , " A member for working at height that is attached to the tip of the arm of a crane, A frame having a substantially rectangular outer shape and at least one closed space formed therein; a first support portion extending outwardly from the frame; a first member having a plurality of protruding members protruding from the frame toward the inside of the closed space without closing the closed space; The first member does not have a member that serves as a foothold for a worker, Further comprising a second member, The second member includes: A second support portion detachably connected to the first support portion; A space between the second support portion and the frame is not closed. A crosspiece member, and a lower protruding member protruding from at least the crosspiece member and having a free end. It can be said that:

[0020] The member for working at height of this configuration is equipped with a second member, and the second member can be used as a scaffold. Specifically, the sole of the foot can be placed on the intersection of the lower protruding member protruding from at least the crosspiece member and the crosspiece member to use as a scaffold. Therefore, when there is no scaffold that can support the body weight, such as the branches or rump of a tree, or a civil engineering or architectural structure, or when an external scaffold is difficult to use, the member for working at height with a scaffold can be used by connecting the second support to the first support. On the other hand, when an external scaffold is used, the second member is removed and used.

[0021] In this manner, the member for working at height having this configuration and equipped with the second member can be used in two ways: with the second member attached, and with the second member removed.

[0022] In addition, when the second member is attached, the crosspiece extends from the second support member connected to the first support member in a crossing direction without closing the space between the second member and the frame. In other words, the second member is cantilevered by the first member. Therefore, even if the second member serving as a foothold is provided, the second member can be made lighter than when it is supported on both sides of the frame. Furthermore, since the space on the opposite side of the cantilever support is open, there is an advantage that it is easier to enter a narrower space than when the second member is supported on both sides of the frame.

[0023] Next, the method for working at height according to the present invention comprises the steps of: "A method of working at height using a member for working at height comprising the second member described above, a first rope and a second rope, The first rope is U-shaped with both ends fastened to both sides of the worker's torso and is equipped with a first length adjuster, The second rope is a rope that is looped by fastening both ends to the abdomen of the worker, or a rope that is fastened to the abdomen of the worker at one end and has a loop-shaped portion at the other end that can be opened and closed, and is equipped with a second length adjuster; The first rope supports the body of the worker on the member for working at height, while the second rope is passed through the closed space, and one of the intersections between the frame and the protruding member is set as an anchor point of the second rope, thereby making it possible to change the anchor point of the second rope; By adjusting the length using the first length adjuster or the second length adjuster, tension is applied to at least one of the first rope and the second rope, and the worker's body is supported by the member for working at height while work is performed using a work positioning system; When using scaffolding external to the high-altitude work member, the second member is removed by disconnecting the first support portion from the second support portion, and when the second support portion is connected to the first support portion, the second member is used as scaffolding.

[0024] This is a method of working at height using a member for working at height when the second member is provided, and as described above, two types of work are possible: work can be carried out using the second member as scaffolding with the second member attached, and work can be carried out using external scaffolding with the second member removed. Effect of the Invention

[0025] As described above, according to the present invention, it is possible to provide a member for working at height that is easier to use and applicable to a wider range of work, and a method for working at height using the member for working at height. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 is an exploded view of a member for working at height according to one embodiment of the present invention. [Diagram 2] 2 is a diagram for explaining the relationship between the first rope and the second rope worn by a worker and the member for working at height in FIG. 1. FIG. [Diagram 3] FIG. 11 is a diagram illustrating high-altitude work using a high-altitude work member with a second member attached thereto. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, a member for working at height 1 according to one embodiment of the present invention and a method for working at height using the member for working at height 1 will be specifically described with reference to the drawings.

[0028] First, the configuration of the member for working at height 1 will be described mainly with reference to Fig. 1. The member for working at height 1 comprises a first member 10 and a second member 20.

[0029] The first member 10 includes a frame 10f, a first support 11, a support member 12, and a plurality of protruding members 18a, 18b. The frame 10f has a generally elongated rectangular shape and has a first closed space S1 inside. This first closed space S1 corresponds to the "closed space" of the present invention. The size of the frame 10f can be, for example, 80 cm to 120 cm in the longitudinal direction and 15 cm to 40 cm in the direction perpendicular to the longitudinal direction.

[0030] Only one first support column 11 extends from one end of the frame 10f in the longitudinal direction. The first support column 11 is cylindrical and forms an angle slightly smaller than a right angle with respect to the longitudinal direction of the frame 10f. The first support column 11 has a plurality of through holes 11h. These through holes 11h are used to attach the first member 10 to the tip of the arm of the crane and to connect to the second member 20.

[0031] Here, the member for working at height 1 is used so that the first support column 11 faces up and down. As described later, the member for working at height 1 is used so that the worker's posture is maintained, so it is not used turned over by 90 degrees or inverted by 180 degrees, but it may be used tilted. Therefore, the up and down direction of the member for working at height 1 refers to the up and down direction of the worker supported by the member for working at height 1, and does not refer only to the vertical direction.

[0032] Considering the vertical direction of the frame 10f in correspondence with the vertical direction of the member for working at height 1 in use, a plurality of protruding members 18a protrude from a portion extending in the longitudinal direction below the frame 10f toward the inside of the first closed space S1 without closing the first closed space S1. The protruding height of the protruding members 18a can be set to 5 cm to 20 cm.

[0033] The support member 12 connects a portion of the first support portion 11 that is slightly away from the joint with the frame 10f to a portion of the frame 10f that is slightly away from the joint with the first support portion 11. As a result, the frame 10f, the first support portion 11, and the support member 12 form a triangular frame, inside which a second closed space S2 is formed.

[0034] In this embodiment, a plurality of protruding members 18b protrude from the support member 12 toward the inside of the second closed space S2 without closing the second closed space S2. The protruding height of the protruding members 18b can be set to 5 cm to 20 cm, similar to the protruding members 18a.

[0035] The second member 20 includes a second support portion 21, a crosspiece member 22, and lower protruding members 28a and 28b.

[0036] The second support column 21 is a member longer than the first support column 11, and has a cylindrical or columnar connecting portion 21b at one end. The outer size of the connecting portion 21b is slightly smaller than the inner circumference of the first support column 11, and the connecting portion 21b can be inserted into the end of the first support column 11. A plurality of through holes 21h are drilled in the connecting portion 21b. The intervals between the plurality of through holes 21h are equal to the intervals between the plurality of through holes 11h in the first support column 11, and the second support column 21 can be connected to the first support column 11 by inserting the connecting portion 21b into the end of the first support column 11, and then inserting a pin through the through holes 21h and the through holes 11h and fastening them with a fastener.

[0037] The crosspiece member 22 extends from the end of the second support portion 21 opposite to the end where the connecting portion 21b is provided, in a direction intersecting the axial direction of the second support portion 21. The angle that the crosspiece member 22 forms with the second support portion 21 is an obtuse angle, and when the second support portion 21 is connected to the first support portion 11, the crosspiece member 22 is substantially parallel to the longitudinal direction of the frame 10f. In other words, the crosspiece member 22 extends without closing the space between the frame 10f.

[0038] A lower protruding member 28a protrudes from the second support portion 21 so as to form a right angle with respect to the second support portion 21. Furthermore, a plurality of lower protruding members 28b protrude from the crosspiece member 22 so as to form a right angle with respect to the crosspiece member 22. The length of the lower protruding members 28a, 28b may be 5 cm to 20 cm. Although the figure shows a case where there is one lower protruding member 28a, there may be a plurality of lower protruding members 28a.

[0039] The lengths of the first support portion 11 and the second support portion 21 can be set so that the distance between the frame 10f and the crosspiece member 22 is 130 cm to 180 cm when both are connected.

[0040] Although not shown in the drawings, the intersections of the various components in the high-altitude work component 1 (frame 10f, first support portion 11, support member 12, second support portion 21, crosspiece member 23, protrusions 18a, 18b, lower protrusions 28a, 28b) are curved to avoid sharp corners. Also, the outer surface of each component is smooth with no protrusions that could catch the rope. This prevents damage to the rope when it is wound around the intersections of the components or when it is slid along the components.

[0041] Next, a method of using the member for high-altitude work 1 having the above-mentioned configuration will be described. The member for high-altitude work 1 can be used with only the first member 10, and can also be used with the second member 20 attached to the first member 10. In either case, the worker wears a harness, and uses a first rope 41 that is fastened to annular fasteners 31 on both sides of a belt 30 that wraps around the torso to form a U-shape, and a second rope 42 that is fastened to annular fasteners 32 on the abdomen of the belt 30 at both ends to form a ring shape, as shown in FIG. 2. The first rope 41 is provided with a first length adjuster 41b for adjusting the length, and the second rope 42 is provided with a second length adjuster 42b for adjusting the length in the same manner. The first length adjuster 41b and the second length adjuster 42b adjust the length of the rope by friction, and can be one that generates friction by tying the rope or one that generates friction by pinching the rope between metal fittings. Note that Figure 2 illustrates the relationship between the first rope 41 and second rope 42 worn by a worker and the high-altitude work component 1, and does not show the worker and the high-altitude work component 1 while working at height.

[0042] The first rope 41 is passed through the second closed space S2 or the first closed space S1 in the member for working at height 1 and then fastened to the fastener 31. As a result, the folded-back portion of the first rope 41 is inside the closed space, so that the first rope 41 does not come off the member for working at height 1. For example, as shown in Fig. 2, when the first rope 41 is passed through the second closed space S2, any one of a plurality of intersections between the first support part 11 and the support member 12 constituting the second closed space S2 and the intersections between the support member 12 and the protruding member 18b becomes an anchor point of the first rope 41.

[0043] The second rope 42 is passed through the first closed space S1 in the member for high-altitude work 1 and then fastened to the fastener 32. As a result, the folded-back portion of the second rope 42 is also inside the first closed space S1, so that the second rope 42 does not come off the member for high-altitude work 1. Here, a rope having both ends fastened to the fastener 32 to form a loop is exemplified as the second rope 42, but a rope having one end fastened to the fastener 32 and an openable loop-shaped portion at the other end can be used as the second rope 42. In this case, the second rope 42 is passed through the closed space with the loop-shaped portion at the tip open, and then the loop-shaped portion is closed. Even with such a second rope 42, the folded-back portion of the loop-shaped portion is inside the closed space, so that the second rope 42 does not come off the member for high-altitude work 1. Examples of ways in which the loop portion of the second rope 42 can be opened and closed include an arrangement in which a metal fitting that opens and closes in a circular shape, such as a carabiner, is attached to the end of a single rope and both ends of a short rope are fastened to this fitting, and an arrangement in which a loop portion is created by tying the end of a single rope.

[0044] In the first closed space S1 through which the second rope 42 is passed, the protruding member 18a protrudes from the frame 10f, and the end of the protruding member 18a is a free end. Therefore, by setting the position of the member for working at height 1 so that the protruding direction of the protruding member 18a is upward, the anchor point of the second rope 42 can be moved without removing the second rope 42 from the member for working at height 1. Specifically, each of the multiple intersections between the frame 10f and the protruding member 18a becomes the anchor point of the second rope 42.

[0045] Similarly, the protruding member 18b protruding inward in the second closed space S2 through which the first rope 41 passes also has a free end. Therefore, the multiple intersections between the support member 12 and the protruding member 18b are each used as anchor points for the first rope 41, and the anchor points can be moved.

[0046] Next, a method of working at height using the member for working at height 1 will be described. First, a case where only the first member 10 is used will be described. Prior to using the member for working at height 1, the first member 10 is attached to the arm of a crane. Although not shown, the crane is provided with a mounting fixture with a U-shaped cross section, in which a pair of side sections are connected on the same side, at the tip of the arm. A plurality of through holes are drilled at corresponding positions in the pair of side sections, and the interval between these through holes is the same as the interval between the plurality of through holes 11h in the first support section 11. Therefore, the first support section 11 of the first member 10 is positioned between the pair of side sections of the mounting fixture of the crane, and the pin passed through the through hole of the mounting fixture and the through hole 11h of the first support section is fastened with a fastener, so that the first member 10 can be fixed to the arm of the crane.

[0047] The worker hangs from the member for working at height 1 with the attached first rope 41 and second rope 42 passed through the closed space as described above. In this state, by controlling the extension and elevation angle of the arm of the crane, the member for working at height 1 is moved to a place where the worker will use as a foothold, such as the branch or rump of a tree, or a civil engineering or architectural structure.

[0048] When the worker reaches the scaffold, he stands on it and performs work while moving on it, but during work, the lengths of the first rope 41 and the second rope 42 are adjusted to keep at least one of them under tension. This allows the worker to take various postures while his body is stably supported by the member for working at height 1. Even when the worker changes his body position or posture as the work progresses, or when the arm of the crane is moved as the worker moves, or when the angle of the member for working at height 1 is changed by changing the angle at which the arm is raised or lowered, at least one of the two ropes is always kept under tension.

[0049] In this way, high-altitude work performed using the high-altitude work component 1 of this embodiment is performed using the work positioning system, so work can be performed with the body leaning outward from the scaffolding, and work can be performed over a wide area.

[0050] As described above, in the first closed space S1 through which the second rope 42 passes, a plurality of protruding members 18a having free ends protrude inward, so that the anchor point can be moved without removing the second rope 42. Since the length of the second rope 42 needs to be changed in order to move it, there is a time during the movement when no tension is applied to the second rope 42, but even during that time the worker's body can be stably supported by the tension of the first rope 41.

[0051] When a worker changes his / her position relative to the member for working at height 1 to assume a more stable posture, the angle of the member for working at height 1 may be changed. The angle of the member for working at height 1 can be changed by changing the hoisting angle of the arm of the crane, and the hoisting angle of the arm can be changed by the operator of the crane body operating the control device, or by a control signal sent to the control device from a remote control carried by the worker performing the work at height.

[0052] Furthermore, there are cases where the anchor point of the first rope 41 needs to be changed in order for the worker to take a posture that is easy to work in. As shown in the figure, when the first rope 41 is passed through the second closed space S2, the anchor point can be moved without removing the first rope 41 because the second protruding members 18b, each having a free end, protrude toward the inside of the second closed space S2. In this case, too, there is a time when the first rope 41 is not tensioned due to the movement of the first rope 41, but during that time, the body of the worker can be stably supported by the tension of the second rope. In addition, when the closed space through which the first rope 41 is passed is changed to a different closed space (from the second closed space S2 to the first closed space S1, or vice versa), the first rope 41 is temporarily removed from the member for high-altitude work 1, but the second rope 42 is passed through the first closed space S1 and does not come off from the member for high-altitude work 1. Therefore, by applying tension to the second rope 42, the body of the worker can be stably supported by the member for high-altitude work 1 even while the first rope 41 is removed.

[0053] Furthermore, in the past, when pruning trees, a worker would climb a tree and fasten a rope or the like to the tree's branches or trunk to support the worker's body. Therefore, if the branch selected as the anchor point was dead or rotten and had low strength, the branch could break and the worker could fall. In contrast, when working using the member for working at height 1, even if the worker's weight is placed on an external scaffold, the anchor points of the first rope 41 and the second rope 42 are always inside the member for working at height 1. Therefore, even if the worker loses his footing due to the branch breaking, the first rope 41 and the second rope 42 can prevent the worker from falling.

[0054] In addition, the first member 10 as the member for working at height 1 does not have a member that can be used as a foothold, and has a shape close to an approximately L-shape or a V-shape with only one first support part 11 extending from the end of the frame 10f. Therefore, it is easy to enter a very narrow space that has a foothold, such as a tree crown with thick branches.

[0055] In addition, the first member 10 has two closed spaces (first closed space S1, second closed space S2), and in each of them, a protruding member with a free end protrudes toward the inside of the closed space (protruding members 18a, 18b). Therefore, there are various postures that can be taken by moving the anchor point without removing the first rope 41 or the second rope 42, and the range of work targets is wider.

[0056] Furthermore, the support member 12 not only forms a second closed space S2 between the frame 10f and the first support portion 11, but also acts to increase the mechanical strength of the first member 10 by diagonally connecting the frame 10f and the first support portion 11.

[0057] Furthermore, the first member 10 has a very simple configuration with only a single first support extending from the end of the frame 10f, so it is lightweight and can be easily attached to the end of the crane's arm by hand, and its simple configuration allows it to be manufactured at low cost.

[0058] Next, a case where the member for working at height 1 is used in a state where the second member 20 is connected to the first member 10 will be described. When connecting the second member 20 to the first member 10, the connecting portion 21b of the second support portion 21 is inserted into the free end of the first support portion 11, and the first support portion 11 is sandwiched between a pair of side portions of the mounting fixture on the arm of the crane in the same manner as described above. The through hole provided on the side portion of the mounting fixture is communicated with the through hole 11h of the first support portion 11 and the through hole 21h of the second support portion 21, and a pin 51 is passed through the through hole and fastened with a fastener (see FIG. 3), whereby the first member 10 can be fixed to the arm of the crane while the second member 20 is connected to the first member 10.

[0059] When working at height using the member for working at height 1 with the second member 20 attached thereto, the second member 20 can be used as a foothold for the worker, as shown in Fig. 3. In the second member 20, the lower protruding member 28b protrudes from the crosspiece member 22, and thus the worker can use it as a foothold that is not slippery by placing the sole of the foot thereon. In addition, the lower protruding portion 28a protrudes from the second support portion 21, and thus the worker can use it as a foothold by placing the sole of the foot thereon.

[0060] Except for the fact that the part that serves as the worker's foothold is the configuration of the high-altitude work member 1 itself, the method of working at height while applying tension to at least one of the first rope 41 and the second rope 42 is the same as the above-mentioned high-altitude work method using the first member 10 as the high-altitude work member 1.

[0061] When a worker is transported to a work site with the member for working at height 1 having the second member 20 attached, the worker can climb onto the member for working at height 1 without being suspended, and can be transported with the worker's body supported by the member for working at height 1. While the worker is on the member for working at height 1, even when the arm of the crane is being moved or when working at height, the member for working at height 1 supports the worker's body by keeping at least one of the first rope 41 and the second rope 42 under tension at all times.

[0062] The member for working at height 1 with the second member 20 attached can be used as a scaffold for working at height, and is therefore suitable for work when there is no scaffold outside or when an external scaffold is difficult to use, for example, when pruning from the periphery of a tree crown or when working inside a tree crown with thin branches.

[0063] In addition, the second member 20 is supported by the first member 10 in a cantilever manner. Therefore, even if the second member 20 serving as a foothold is provided, the second member 20 is lighter than when it is supported on both sides of the frame. Furthermore, since the space on the opposite side of the cantilever support is an open space Os, there is an advantage that it is easier to enter a narrower space than when the second member 20 is supported on both sides of the frame, and it is easier for the worker to change the direction and posture of his or her body.

[0064] The member for working at height 1 can be used in two ways: with the second member 20 attached, and with the second member 20 removed. Therefore, work at height can be performed by attaching and detaching the second member 20 when an external scaffold is used and when there is no external scaffold or when there is an external scaffold but it is difficult to use.

[0065] The present invention has been described above with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and various improvements and design changes are possible without departing from the spirit of the present invention, as described below.

[0066] For example, the positions and numbers of the protruding members 18a, 18b and the lower protruding members 28a, 28b are not limited to those shown in the drawings. Also, although the example shows a case where there is one closed space (first closed space S1) inside the frame 10f, there may be two or more closed spaces.

[0067] In the above, an example was given of a case where the through hole 11h provided in the first support portion 11 for attachment to the arm of the crane is also used for connecting the second support portion 21 to the first support portion 11. However, the present invention is not limited to this, and a through hole for connecting the second support portion 21 can be provided in the first support portion 11 separately from the through hole 11h. In that case, the second member 20 can be connected to the first member 10 after the first member 10 is attached to the arm of the crane, which further reduces the labor burden and makes manual work easier.

[0068] Furthermore, in the above, an example was given in which the member for working at height 1 comprises the first member 10 and the second member 20, and the second member 20 can be attached and detached as necessary. However, the present invention is not limited to this, and the member for working at height may be configured as only the first member 10 without the second member 20, on the premise that an external scaffolding will be used. In this case, the first support part can be configured as a solid member, since there is no need to insert the second support part.

[0069] In the above, tree pruning has been mainly used as an example of work at height, but the work at height component of the present invention can be used for various work at height, such as electrical work in tall buildings and painting work on exterior walls. [Explanation of symbols]

[0070] 1. Materials for working at height 10 First member 10f Frame 11 First support section 18a, 18b Protruding members 20 Second member 21 Second support section 22 Crosspieces 28a, 28b Lower protruding member 30 Belt 41 First Rope 41b First length adjuster 42 Second Rope 42b Second length adjuster S1 First closed space S2 Second closed space

Claims

1. A member for working at height that is attached to the tip of the arm of a crane, A frame having a substantially rectangular outer shape and at least one closed space formed therein; a first support portion extending outwardly from the frame; a first member having a plurality of protruding members protruding from the frame toward the inside of the closed space without closing the closed space; The first member does not have a member that serves as a foothold for a worker, The first support portion extends from one end of the frame, so that the first member has an "L" shape or a "L" shape. A member for working at height.

2. A member for working at height that is attached to the tip of the arm of a crane, A frame having a substantially rectangular outer shape and at least one closed space formed therein; a first support portion extending outwardly from the frame; a first member having a plurality of protruding members protruding from the frame toward the inside of the closed space without closing the closed space; The first member does not have a member that serves as a foothold for a worker, Further comprising a second member, The second member includes: A second support portion detachably connected to the first support portion; a crosspiece member extending from the second support portion in a cross direction without closing a space between the second support portion and the frame; A lower protruding member protruding from at least the crosspiece member and having a free end. A member for working at height.

3. A method for working at height using the member for working at height according to claim 2, a first rope and a second rope, The first rope is U-shaped with both ends fastened to both sides of the worker's torso and is equipped with a first length adjuster, The second rope is a rope that is looped by fastening both ends to the abdomen of the worker, or a rope that is fastened to the abdomen of the worker at one end and has a loop-shaped portion at the other end that can be opened and closed, and is equipped with a second length adjuster; The first rope supports the body of the worker on the member for working at height, while the second rope is passed through the closed space, and one of the intersections between the frame and the protruding member is set as an anchor point of the second rope, thereby making it possible to change the anchor point of the second rope; By adjusting the length using the first length adjuster or the second length adjuster, tension is applied to at least one of the first rope and the second rope, and the worker's body is supported by the member for working at height while work is performed using a work positioning system; When using a scaffolding outside the high-altitude work member, the second member is removed by disconnecting the first support portion from the second support portion, and the second member is used as a scaffolding when the second support portion is connected to the first support portion. A method for working at height, comprising:

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